test: device token

pkg/mqtt/connection.go

@@ -193,7 +193,7 @@ func (c *Connection) RcvMsgFromClient() {
 			}
 			err = c.ValidateToken(token)
 			if err != nil {
-				server.Log.Errorf("validate device token error. deviceid : %v, token : %2X, error: %v", c.DeviceCode, token, err)
+				server.Log.Errorf("validate device token error. deviceid : %v, token : %s, error: %v", c.DeviceCode, hex.EncodeToString(token), err)
 				ret = RetCodeNotAuthorized
 				c.Close()
 				return